which is the momentum flow along the string at point \(\phi _s\) . If we use the metric of AdS-Sch, the drag force for \(\mathcal {N}=4\)  SYM plasma can be obtained as [1]}, [2]}, [3]}
\(F_{drag}^{SYM}=-\frac{\pi \,T^2\,\sqrt{\lambda }}{2} \frac{v}{\sqrt{1-v^2}} \, ,\) 
